Case Knives Amber Bone SS series includes 15 different pocket knife patterns with jigged amber bone handle scales and stainless blades. All knives are hand made in the USA, with a highly polished finish to the blades, bolsters, backsprings and handle scales. The year of manufacture of each Case knife can be identified using the XX and dot system marked on the blade tang. Further information on the marking system can be found on the WR Case website.